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Check Valves
ANSI B16.34 (API 600 WALL THICKNESS) DESIGN
Click image to enlargeComplete Solutions for Industrial Valve Manufacturing
Check valves are the most commonly used to prevent flow reversal (or backflow) in piping systems. They are suitable for service both in horizontal or vertical (flow upwards only) installation positions. Swing check valves have low pressure drops and are best suited for moderate velocity applications. Correct sizing of swing check valves is very important. Either too low or too high of a line velocity can damage valve internals and greatly shorten the valve life. Swing check valves are not recommended for services in systems involving rapid and frequent flow reversals, pulsation or turbulent flow patterns. And sometimes, relocating a swing check valve within the piping system can often minimize or eliminate problems caused by this type of application.
Check valves are available in two basic styles or types. In the first, the flow control element is called a disc, plate, or flapper. This can be one flapper or a dual flapper. The flapper(s) rotate around the axis which runs perpendicular to the flow path. The second style or type, the flow control element is a disc, ball or piston and the movement is up and down along this axis. In both styles, there is not mode of manual operation. The force of fluid movement causes the flapper to unseat and open. If the flow stops, the weight of the flapper, an auxiliary spring, or both, cause the flow control element to return to its seating position. Once seated, the opening is completely closed, which prevents any reverse flow from occurring, as the back-pressure of the fluid assists in making a tighter seal.
Check valves should be sized not only to match the existing pipe lines, but also should be sized according to flow conditions to maximize the service life of the valve.
Check valves have numerous types of body/bonnet joints, dependent upon which type of valve is needed. Some types for you to choose from are bolted bonnet, pressure-seal bonnet, welded bonnet, threaded bonnet, or union bonnet. These different types of bonnets are usually furnished based on the pressure allowances of the valve itself.
Warren Valves can also accommodate you with most any type of valve modification needed. We can provide trim changes, outside lever and weight, end configuration changes, and many more options which we will be happy to discuss with you to accommodate your requirements.
Our Products
More detailed information, such as Cv values and cracking pressures is available from our valve group personnel.
For more information about our products, please contact a representative!